Priming effect of benthic gastropod mucus on sedimentary organic matter remineralization.
Priming effect of benthic gastropod mucus on sedimentary organic matter remineralization.
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DOI：
10.1002/lno.10325
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发表时间：
2016-09
影响因子：
4.5
通讯作者：
Aller, Robert C.
中科院分区：
文献类型：
--
作者：
Hannides, Angelos K.;Aller, Robert C.
底栖动物产生的粘液凝胶迅速而大量，因此它们是一种可能的启动基质，其适量的添加可能会影响沉积有机质（SOM）的矿化。以普通腹足类Neverita duplicata的粘液为模型底物，研究了底栖动物粘液的启动效应。其组成是典型的海洋软体动物粘液，主要由水组成（>96%重量）。无盐干重占粘液总量的0.7%。C、N和S含量之间的关系显示存在无N和无S级分，表明粘多糖，其约占存在的总C的一半。含N组分的C/N比（足和下鳃粘液分别为6.1和8.75）表明存在碳水化合物-蛋白质复合物。含S组分的C/S比值相对较低（足和下鳃粘液分别为21.8和10.5），并且用阿尔新蓝染料染色阳性，表明S-酯和烷基-SO 42 −基团桥接粘多糖和糖蛋白组分。厌氧培养的足粘液，沉积物和粘液-沉积物混合物的产生的CO2和NH 4+的比例低于基板C/N比，表明优先分解的富N组分。在粘液-沉积物孵育中，CO2和NH 4+的产生率分别比仅粘液和仅沉积物速率的线性相加预测的高9±16%和29± 11%。在适度的粘液贡献的存在下，N的加速矿化速率表明，底栖粘液除了可以影响SOM矿化过程通过“启动”效应。
Mucous gels are produced by benthic animals rapidly and in copious amounts, and consequently they are a possible priming substrate whose addition in modest amounts may affect sedimentary organic matter (SOM) remineralization. The priming effect of benthic infaunal mucus was tested using mucus of the common gastropod Neverita duplicata as model substrate. Its composition is typical of marine molluscan mucus, consisting primarily of water (>96% by weight). Salt-free dry weight constitutes 0.7% of total mucus. Relationships between C, N and S content show the presence of N-free and S-free fractions, indicative of mucopolysaccharides, that account for approximately half of the total C present. The C/N ratios of the N-containing fraction (6.1 and 8.75 for pedal and hypobranchial mucus, respectively) are indicative of a carbohydrate-protein complex. Relatively low C/S ratios for the S-containing fraction (21.8 and 10.5 for pedal and hypobranchial mucus, respectively) and positive staining with Alcian Blue dye are indicative of S-ester and alkyl-SO42− groups bridging mucopolysaccharide and glycoprotein components. Anaerobic incubations of pedal mucus, sediment and mucus-sediment mixture resulted in the generation of ΣCO2 and NH4+ at ratios lower than substrate C/N ratios, indicating the preferential decomposition of N-rich components. Production rates of ΣCO2 and NH4+ in mucus-sediment incubations are higher, by 9±16% and 29±11%, respectively, than those predicted from linear addition of mucus-only and sediment-only rates. The accelerated remineralization rate of N in the presence of modest mucus contribution suggests that benthic mucus addition can affect SOM remineralization processes through a “priming” effect.
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影响因子：
0.5
作者：
ALLER, RC
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